Cutting tool

A cutting tool, comprising:

• a columnar grip part defining a rotational center axis of the cutting tool;
• a cutting part comprising:
• a plurality of stage positions along the rotational center axis, each of the plurality of stage positions having:
• a plurality of recessed chip pockets, and
• a plurality of cutting inserts, each cutting insert disposed on a respective one of the plurality of recessed chip pockets, wherein the plurality of cutting inserts are arranged along a circumferential direction,
• a channel system comprising:
• an inflow port formed in the grip part,
• a plurality of first channels extending in parallel to the rotational center axis and linearly from an end part of the grip part on an opposite side to the cutting part;
• and
• a plurality of second channels extending linearly from at least one of the first channels toward the plurality of cutting inserts, wherein each of the second channels includes an outflow port formed in a vicinity of a respective one of the plurality of cutting inserts,
• the at least one first channel includes a center axis decentered from the rotational center axis, and
• a number of first channels is smaller than a number of the plurality of cutting inserts arranged along the circumferential direction at one of the plurality of stage positions along the rotational center axis.